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These are some of the rotary position encoders used on Centroid controls over the years.

Dynapar F14 and F18 Encoders

Made by Dynapar division of Danaher Controls.
Manufacturer's web site

1/4", 3/8" and 6mm thru-hole hollow-shaft, flex mount, 2x set screws in collar.
Used on various motors and as replacement, ca. 2003-present.

Set screws are 90° apart, and accept 1/16" hex wrench. Flexible base is anchored with two screws.

Motors supplied by the Centroid factory with these encoders use a black plastic Waldom C-Grid connector.

When used as a replacement for the EPC encoders in Servo Dynamics/SEM motors on Revolution machines, a DB9 male connector is fitted.

These encoders are generally available for immediate shipment.

Dynapar F14 or F18 encoder: $210

Pin-outs

Waldom C-Grid		DB9M
Pin Signal Color 1 ch A BLU 2 ch /A BLU/BLK 3 ch B GRN 4 ch /B GRN/BLK 5 ch Z VIO 6 ch /Z VIO/BLK 7 Vcc RED 8 COM BLK 9 shield shield		Pin Signal Color 1 n/c 2 COM BLK 3 ch /Z VIO/BLK 4 ch /B GRN/BLK 5 ch /A BLU/BLK 6 ch Z VIO 7 ch B GRN 8 ch A BLU 9 Vcc RED shell shield shield

Quantum Devices QD145

Distributed by Quantum Devices, Barneveld WI
Manufacturer's web site

1/4" thru-hole hollow-shaft, flex mount, 2x 4-40 set screws in collar.
Used on black Glentek DC servo motors ca. 2005.

The electronic connection is a black plastic Waldom C-Grid connector.

Pin-out

EPC 755A Encoder

Made by Encoder Products Company, Sandpoint Idaho.
Manufacturer's web site

1/4" and 3/8" blind hollow-shaft, flex mount, 2x set screws in collar.
Used on orange-cap SEM DC servo motors ca. 1993-1999.

Set screws are 90° apart, and accept 1/16" hex wrench. Flexible base is anchored with two screws.

Orange-cap SEM motors supplied by the Centroid factory from 1994 to 1998 or so used these encoders with a 3/8" bore and a black plastic Waldom C-Grid connector.

Orange-cap SEM motors with a Servo Dynamics label, supplied with most Revolution machines from 1996 to 1999, used these encoders with a 1/4" bore and a DB9 male connector (as pictured).

These encoders are still available through EPC distributors. However, because of their high cost I usually replace failed units with an equivalent Dynapar encoder instead.

Pin-outs

Sumtak LHE-514 Encoder

6mm blind hollow-shaft, flex mount, 2x set screws in collar.
Used on blue-cap SEM DC servo motors ca. 2001.

Set screws are 90° apart, and accept 1.5mm hex wrench. Flexible base is anchored with a single screw.

This encoder is no longer available, but I have equivalent Dynapar encoders in stock.

Pin-out

Danaher M21 Encoder

Manufacturer's web site

3/8" and 6mm thru-hole hollow-shaft, direct mount.
Used on blue-cap SEM DC servo motors ca. 1999-2000

The installation procedure is tricky, and should not be attempted without manufacturer instructions. The encoder body rotates to capture or free the encoder disk. You install the encoder with the disk captured; tighten the shaft clamp with a 5/64" hex wrench; then rotate the body to free the disk. To remove the encoder, you rotate the body to capture the disk; loosen the shaft clamp with a 5/64" hex wrench; then remove the base.

Danaher M21 Installation Guide

This encoder is still available, but I generally use an equivalent Dynapar F-series encoder as a replacement because of the simpler installation procedure.

Pin-outs

Lucas Ledex S-10285

Distributed by Lucas Ledex, Vandalia OH
Ledex is evidently no longer in the optical encoder business.

3/8" blind hollow-shaft, flex mount, pinch screw in collar.
Used on orange-cap SEM DC servo motors ca. 1994-1995.

Many orange-cap SEM motors supplied by the Centroid factory in 1994 and 1995 used these encoders with a 3/8" bore, but on a 1/4" stub shaft. Centroid installed a plastic bushing to adapt the shaft to the bore. This arrangement was prone to slippage if not adequately tightened, leading to gradual position loss issues.

The electronic connection was a black plastic Waldom C-Grid connector.

These encoders are no longer available. They can be easily replaced with a 1/4" Dynapar F14, eliminating the need for the bushing.

Pin-out

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Copyright © 2011 Marc Leonard
Last updated 17-Jul-2010 MBL